The answer is 10, this is because 7 1/2 = 7.5 3/4=.75 and if there is 7.5 inches of ribbon, but cut into .75 pieces you would divide 7.5 by .75 which equals 10.
A)
Let X be the food expenditure of a family.
Let the population mean of an expenditure of a family be.
Let the population standard deviation of an expenditure of a family be.
The proportion families spend more than $30 but less than $490 per month on food is,
